Pipes bug when spawning non-cygwin processes

Takashi Yano takashi.yano@nifty.ne.jp
Thu Jan 30 22:25:00 GMT 2020

On Thu, 30 Jan 2020 14:03:50 -0500
Edward Lam wrote:
> I'm getting a problem where cygwin parent processes spawning non-cygwin
> child processes no longer detect when stdin has been closed. Please see the
> sample python code at the end where I've isolated the problem. I've got
> cygwin's python2 running spawn_bar.py that popen's a native non-cygwin
> python2 running bar.py. The steps to reproduce are to run this command
> using the two files detailed at the end of this email:
> $ python2 spawn_bar.py
> On Windows 10, this command quits right away as expected when using cygwin
> 3.0.7 but hangs when using cygwin 3.1.2 (version number as reported from
> running `cygcheck -c cygwin`).
> Looking through the release logs, nothing sticks out except for the change
> in 3.1.0 that mentions PTY changes. However, when I originally ran into
> this, it wasn't even being done through a terminal but some background
> script.
> Any ideas?

Probably, this is the same issue as

Please try latest cygwin snapshot.

Takashi Yano <takashi.yano@nifty.ne.jp>

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